Chinese grammar: the self-evident with 嘛ma

The particle 嘛 (ma) is a sentence-final particle identical in pronunciation to the simple "yes/no question" particle 吗 (ma) you learned back in the day, but with a rather different function. It can be used when the speaker feels what he is saying is obvious (from his point of view).

Sentence-Final Structure 
statement+嘛

Examples 

Zhōnɡ ɡuó rén kǒu hěn duō mɑ.
中国 人口 很 多 嘛。

The Chinese population is huge.

Topic-Marking Structure 
An alternate form is:
topic+嘛，+statement

This basically allows the speaker to state the topic, then gather his thoughts before making a comment on it. In this pattern, the following comment may or may not be one the speaker feels is obvious.

Examples 

Dà xiónɡ māo mɑ, hái zi men dōu hěn xǐ huɑn.
大熊猫嘛，孩子们都很喜欢。

Pandas.Children all like them.